Acoustic amplifiers; Assistive listening device not for medical purposes; Audio amplifiers; Batteries for use in hearing aids; Digital sound processors; Handheld electronic units for adjusting sound levels in hearing aids; Personal headphones for sound transmitting apparatuses; Personal headphones for use with sound transmitting systems; Sound amplifiers; Sound transmitting apparatus

'acoust':1 'adjust':25 'aid':17,30 'amplifi':2,11,46 'apparatus':36,49 'assist':3 'audio':10 'batteri':12 'devic':5 'digit':18 'electron':22 'handheld':21 'headphon':32,38 'hear':16,29 'level':27 'listen':4 'medic':8 'person':31,37 'processor':20 'purpos':9 'sound':19,26,34,42,45,47 'system':44 'transmit':35,43,48 'unit':23 'use':14,40

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